Treatment of granular solids in an annular fluidized bed with microwaves

A granular solid, fluidized bed technology, applied in microwave heating, drying of solid materials, chemical/physical/physical-chemical processes of applying energy, etc., can solve problems such as weakening microwave radiation performance

Inactive Publication Date: 2006-02-08
OUTOKUMPU OY
View PDF2 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But in this case, deposits on the window will weaken the microwave radiation performance

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Treatment of granular solids in an annular fluidized bed with microwaves
  • Treatment of granular solids in an annular fluidized bed with microwaves
  • Treatment of granular solids in an annular fluidized bed with microwaves

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0054] Embodiment (calcined gold ore)

[0055] A specific example of the method of the present invention is the calcining of gold ore, which is image 3 performed in the device shown.

[0056] In this application, the Froude number Fr of the particles in the fixed annular fluidized bed 8 p About 0.35, the particle Froude number Fr in the mixing chamber 7 p About 1.3, the particle Froude number Fr in the central tube 3 p About 15. The microwave frequency used is about 2.45GHz.

[0057] The table below gives the basic process parameters.

[0058] raw material

[0059] Type Ground, dried and graded gold ore with approximately 5ppm gold

[0060] ≌5g / t

[0061] Particle fraction

[0062] μm 50

[0063] Composition wt%

[0064] Organic carbon 1.05

[0065] CaCO 3 19.3

[0066] Al 2 o 3 12.44

[0067] FeS 2 2.75

[0068] Inert substances such as SiO 2 64.46

[0069] Solid handling capacity, about t / h...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
particle sizeaaaaaaaaaa
diameteraaaaaaaaaa
Login to view more

Abstract

This invention relates to a method for the thermal treatment of granular solids in a fluidized-bed reactor ( 1 ), in which microwave radiation from a microwave source ( 2 ) is fed into the reactor ( 1 ), and to a corresponding plant. To improve the utilization of energy and the introduction of the microwave radiation, a first gas or gas mixture is introduced from below through a preferably central gas supply tube ( 3 ) into a mixing chamber ( 7 ) of the reactor, the gas supply tube ( 3 ) being at least partly surrounded by a stationary annular fluidized bed ( 8 ) which is fluidized by supplying fluidizing gas. The microwave radiation is supplied to the mixing chamber ( 7 ) through the same gas supply tube ( 3 ).

Description

technical field [0001] The present invention relates to a process for the thermal treatment of granular solids in a fluidized bed reactor, wherein microwave radiation is fed into the reactor from a microwave source. Background technique [0002] Such a method is known from US5972302 in which sulphide ores are subjected to an oxidation reaction supported by microwaves. The method mainly involves sintering pyrite in a fluidized bed, where microwaves introduced into the fluidized bed promote the formation of hematite and elemental sulfur, and suppress SO 2 Formation. The fixed fluidized bed used is irradiated by a microwave source placed directly above. The microwave source or point of microwave introduction must be in contact with gases, vapors and dust rising from the fluidized bed. [0003] Examples where a microwave source can be coupled to a mixing chamber are: open waveguides, slot antennas, coupling rings, diaphragms, coaxial antennas filled with gas or other dielectr...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): B01J8/42B01J19/12B01J8/24B01J8/38C22B1/10C22B5/14F26B3/08F26B3/084F26B3/34H05B6/78H05B6/80
CPCH05B6/784C22B1/10F26B3/08B01J8/388B01J19/126H05B6/78B01J2219/1296B01J8/1872H05B6/806F26B3/084C22B5/14B01J8/42B01J2208/00548F26B3/343B01J2208/00442B01J2208/00141
Inventor M·施特勒德T·格德斯M·维勒特-波拉达N·阿纳斯塔耶维克
Owner OUTOKUMPU OY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap